Package org.redisson.api

Interface RSetCache<V>

Type Parameters:

V - value

All Superinterfaces:

Collection<V>, Iterable<V>, RCollectionAsync<V>, RDestroyable, RExpirable, RExpirableAsync, RObject, RObjectAsync, RSetCacheAsync<V>, Set<V>

All Known Implementing Classes:

RedissonSetCache, RedissonTransactionalSetCache

public interface RSetCache<V>
extends Set<V>, RExpirable, RSetCacheAsync<V>, RDestroyable

Set-based cache with ability to set TTL for each object.

Current Redis implementation doesn't have set entry eviction functionality. Thus values are checked for TTL expiration during any value read operation. If entry expired then it doesn't returns and clean task runs asynchronous. Clean task deletes removes 100 expired entries at once. In addition there is EvictionScheduler. This scheduler deletes expired entries in time interval between 5 seconds to 2 hours.

If eviction is not required then it's better to use RSet.

Author:

Nikita Koksharov

Method Summary

Modifier and Type	Method	Description
boolean	add(V value, long ttl, TimeUnit unit)	Stores value with specified time to live.
RLock	getLock(V value)	Returns lock instance associated with value
Iterator<V>	iterator(int count)	Returns an iterator over elements in this set.
Iterator<V>	iterator(String pattern)	Returns values iterator matches pattern.
Iterator<V>	iterator(String pattern, int count)	Returns an iterator over elements in this set.
<KOut,VOut> RCollectionMapReduce<V,KOut,VOut>	mapReduce()	Returns RMapReduce object associated with this map
Set<V>	readAll()	Read all elements at once
int	size()	Returns the number of elements in cache.

Methods inherited from interface java.util.Collection

parallelStream, removeIf, stream

Methods inherited from interface java.lang.Iterable

forEach

Methods inherited from interface org.redisson.api.RCollectionAsync

addAllAsync, addAsync, containsAllAsync, containsAsync, removeAllAsync, removeAsync, retainAllAsync

Methods inherited from interface org.redisson.api.RDestroyable

destroy

Methods inherited from interface org.redisson.api.RExpirable

clearExpire, expire, expireAt, expireAt, remainTimeToLive

Methods inherited from interface org.redisson.api.RExpirableAsync

clearExpireAsync, expireAsync, expireAtAsync, expireAtAsync, remainTimeToLiveAsync

Methods inherited from interface org.redisson.api.RObject

copy, delete, dump, getCodec, getName, isExists, migrate, move, rename, renamenx, restore, restore, restoreAndReplace, restoreAndReplace, touch, unlink

Methods inherited from interface org.redisson.api.RObjectAsync

copyAsync, deleteAsync, dumpAsync, isExistsAsync, migrateAsync, moveAsync, renameAsync, renamenxAsync, restoreAndReplaceAsync, restoreAndReplaceAsync, restoreAsync, restoreAsync, touchAsync, unlinkAsync

Methods inherited from interface org.redisson.api.RSetCacheAsync

addAsync, readAllAsync, sizeAsync

Methods inherited from interface java.util.Set

add, addAll, clear, contains, containsAll, equals, hashCode, isEmpty, iterator, remove, removeAll, retainAll, spliterator, toArray, toArray

Method Detail

getLock

RLock getLock(V value)

Returns lock instance associated with value

Parameters:

value - - set value

Returns:

lock

iterator

Iterator<V> iterator(int count)

Returns an iterator over elements in this set. Elements are loaded in batch. Batch size is defined by count param.

Parameters:

count - - size of elements batch

Returns:

iterator

iterator

Iterator<V> iterator(String pattern,
                     int count)

Returns an iterator over elements in this set. Elements are loaded in batch. Batch size is defined by count param. If pattern is not null then only elements match this pattern are loaded.

Parameters:

pattern - - search pattern

count - - size of elements batch

Returns:

iterator

iterator

Iterator<V> iterator(String pattern)

Returns values iterator matches pattern.

Parameters:

pattern - - search pattern

Returns:

iterator

mapReduce

<KOut,VOut> RCollectionMapReduce<V,KOut,VOut> mapReduce()

Returns RMapReduce object associated with this map

Type Parameters:

KOut - output key

VOut - output value

Returns:

MapReduce instance

add

boolean add(V value,
            long ttl,
            TimeUnit unit)

Stores value with specified time to live. Value expires after specified time to live.

Parameters:

value - to add

ttl - - time to live for key\value entry. If 0 then stores infinitely.

unit - - time unit

Returns:

true if value has been added. false if value already been in collection.

size

int size()

Returns the number of elements in cache. This number can reflects expired elements too due to non realtime cleanup process.

Specified by:

size in interface Collection<V>

Specified by:

size in interface Set<V>

Returns:

size of set

readAll

Set<V> readAll()

Read all elements at once

Returns:

values